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The question asks for a 1 indexed list and the a,b values read in are read in starting from 1 not 0. If you do not use (n+1)if b happens to be the last number of your list it will go out of bounds.
The 0 index value will always be 0 so it doesn't affect your answer when you sum for max difference.
Array Manipulation
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The question asks for a 1 indexed list and the a,b values read in are read in starting from 1 not 0. If you do not use (n+1)if b happens to be the last number of your list it will go out of bounds.
The 0 index value will always be 0 so it doesn't affect your answer when you sum for max difference.